ES484745A1 - Dual phase-control loop horizontal deflection synchronizing circuit - Google Patents
Dual phase-control loop horizontal deflection synchronizing circuitInfo
- Publication number
- ES484745A1 ES484745A1 ES484745A ES484745A ES484745A1 ES 484745 A1 ES484745 A1 ES 484745A1 ES 484745 A ES484745 A ES 484745A ES 484745 A ES484745 A ES 484745A ES 484745 A1 ES484745 A1 ES 484745A1
- Authority
- ES
- Spain
- Prior art keywords
- phase
- horizontal
- coupled
- frequency
- bilevel signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000009977 dual effect Effects 0.000 title 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
- H04N5/126—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal indirectly commands a frequency generator
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
- Details Of Television Scanning (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
A television horizontal deflection synchronizing system uses two phase- lock loops (30, 70). A horizontal oscillator (32) operating at a frequency greater than the horizontal frequency is counted and a bilevel signal near the horizontal frequency is generated. A first phase-lock loop (30) having a relatively long time constant controls the oscillator (32) to maintain the bilevel signal in frequency and phase synchronism with horizontal synchronizing signals. In order to compensate for load-dependent variations in the delay of the horizontal deflection stage, a second phase-lock loop (70) is used. The second phase-lock loop (70) includes a phase detector, (92) one input of which is coupled to an output of the first phase-lock loop (30) and a second input of which is coupled to the deflection circuit (140) for responding to the retrace pulse for enabling the phase detector (92) to produce a current of a first polarity when the bilevel signal has a first value and a current of a second polarity when the bilevel signal has a second value. A loop filter (120) is coupled to an output of the phase detector for filtering the first and second polarity currents to form a control signal. A phase controllable source (72) includes a control input coupled to the loop filter (120) for producing horizontal-rate drive pulses at a time which makes the retrace pulses synchronous with the bilevel signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94877578A | 1978-10-05 | 1978-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES484745A1 true ES484745A1 (en) | 1980-04-16 |
Family
ID=25488242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES484745A Expired ES484745A1 (en) | 1978-10-05 | 1979-10-04 | Dual phase-control loop horizontal deflection synchronizing circuit |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5854545B2 (en) |
| AT (1) | AT382990B (en) |
| AU (1) | AU522723B2 (en) |
| DE (1) | DE2940461C2 (en) |
| ES (1) | ES484745A1 (en) |
| FI (1) | FI71049C (en) |
| FR (1) | FR2438396A1 (en) |
| GB (1) | GB2034137B (en) |
| IT (1) | IT1123415B (en) |
| MY (1) | MY8500721A (en) |
| NZ (1) | NZ191751A (en) |
| PL (1) | PL123959B1 (en) |
| SE (1) | SE440436B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5752268A (en) * | 1980-09-12 | 1982-03-27 | Sanyo Electric Co Ltd | Horizontal synchronizing circuit |
| US4317133A (en) * | 1980-09-29 | 1982-02-23 | Rca Corporation | Two-loop horizontal AFPC system |
| JPS5752271A (en) * | 1980-11-12 | 1982-03-27 | Sanyo Electric Co Ltd | Horizontal synchronizing circuit |
| US4396948A (en) * | 1981-02-11 | 1983-08-02 | Rca Corporation | Dual mode horizontal deflection circuit |
| FR2504763B1 (en) * | 1981-04-27 | 1985-07-05 | Thomson Csf | TELEVISION SCANNING CONTROL CIRCUIT |
| NL8103705A (en) * | 1981-08-06 | 1983-03-01 | Philips Nv | LINE SYNCHRONIZER FOR AN IMAGE DISPLAY. |
| US4510527A (en) * | 1983-03-28 | 1985-04-09 | Rca Corporation | Horizontal deflection phasing arrangement |
| US4639780A (en) * | 1985-04-01 | 1987-01-27 | Rca Corporation | Television synchronizing apparatus |
| JPS6267426A (en) * | 1985-09-20 | 1987-03-27 | Agency Of Ind Science & Technol | Ceramic tester |
| US4769705A (en) * | 1987-06-30 | 1988-09-06 | Rca Licensing Corporation | Deflection synchronizing apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3891800A (en) * | 1971-03-16 | 1975-06-24 | Philips Corp | Line time base in a television receiver |
| US3730989A (en) * | 1971-12-13 | 1973-05-01 | Gte Sylvania Inc | Television horizontal transistor oscillator and afc network |
| US4047223A (en) * | 1976-01-16 | 1977-09-06 | Zenith Radio Corporation | Frequency scanning automatic phase control system |
| JPS5299054A (en) * | 1976-02-16 | 1977-08-19 | Hitachi Ltd | Phase locked loop circuit |
| NL7714033A (en) * | 1977-12-19 | 1979-06-21 | Philips Nv | TELEVISION RECEIVER WITH A LINE SYNCHRONIZE CIRCUIT. |
-
1979
- 1979-09-28 FI FI793025A patent/FI71049C/en not_active IP Right Cessation
- 1979-09-28 AU AU51292/79A patent/AU522723B2/en not_active Expired
- 1979-09-28 SE SE7908091A patent/SE440436B/en not_active IP Right Cessation
- 1979-10-02 IT IT26190/79A patent/IT1123415B/en active
- 1979-10-04 NZ NZ191751A patent/NZ191751A/en unknown
- 1979-10-04 FR FR7924752A patent/FR2438396A1/en active Granted
- 1979-10-04 ES ES484745A patent/ES484745A1/en not_active Expired
- 1979-10-04 PL PL1979218729A patent/PL123959B1/en unknown
- 1979-10-04 GB GB7934508A patent/GB2034137B/en not_active Expired
- 1979-10-05 DE DE2940461A patent/DE2940461C2/en not_active Expired
- 1979-10-05 JP JP54129362A patent/JPS5854545B2/en not_active Expired
- 1979-10-05 AT AT0652779A patent/AT382990B/en not_active IP Right Cessation
-
1985
- 1985-12-30 MY MY721/85A patent/MY8500721A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL218729A1 (en) | 1980-08-11 |
| NZ191751A (en) | 1983-05-10 |
| FI71049B (en) | 1986-07-18 |
| JPS5550779A (en) | 1980-04-12 |
| IT7926190A0 (en) | 1979-10-02 |
| SE7908091L (en) | 1980-04-06 |
| ATA652779A (en) | 1986-09-15 |
| SE440436B (en) | 1985-07-29 |
| AT382990B (en) | 1987-05-11 |
| FI71049C (en) | 1986-10-27 |
| AU5129279A (en) | 1980-04-17 |
| JPS5854545B2 (en) | 1983-12-05 |
| PL123959B1 (en) | 1982-12-31 |
| FR2438396B1 (en) | 1984-06-22 |
| AU522723B2 (en) | 1982-06-24 |
| DE2940461C2 (en) | 1982-05-19 |
| GB2034137B (en) | 1982-10-27 |
| MY8500721A (en) | 1985-12-31 |
| IT1123415B (en) | 1986-04-30 |
| DE2940461A1 (en) | 1980-04-10 |
| GB2034137A (en) | 1980-05-29 |
| FI793025A (en) | 1980-04-06 |
| FR2438396A1 (en) | 1980-04-30 |
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